(tiny like a giant dogs actually, lol...)
So, I think, it would be cool if in the late game you could still see them, not only in some old generated inactive regions. To not mess up with balance, they could spawn just, additionally, around nests, and don't be a part of attacks, becoming aggressive only if player pushing nests, like those which stuck in inactive regions. With this behaviour, they could also be interpreted like baby-biters. And nuking babies is fun, lol :3
Boring looking nest around my base:

Cool looking nests in unloaded regions:
